Home / Lawn and Garden Tractors / John Deere Lawn Tractors / John Deere LX178

John Deere LX178 Troubleshooting

The John Deere LX178 is a LX100 series lawn tractor. This model manufactured from 1991 to 1998. The John Deere LX178 powerline components: Kawasaki FD440V 4-Stroke OHV V-Twin cylinder air-cooled gasoline engine and Tuff Torq K61 belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 26.7 cubic inches (437 cc) engine has a cylinder bore of 2.64" (67 mm), piston stroke of 2.44" (62 mm), and rated power of 15 hp (11.2 kW). The maximum travel speed (forward and reverse): 5.5 mph (8.8 km/h) / 2.5 mph (4 km/h). The tractor is equipped with a manual steering system, mechanical band brakes, 15x6.00-6 front tires, and 20x10.00-8 rear tires. The wheelbase is 46.7" (1180 mm).

The John Deere LX178 is compatible with the following attachments: a 38" mid-mount 2-blade right-discharge mower deck with cutting height of 1.5-4.0 in (38-102 mm) and manual lift system, 44" mid-mount 3-blade rear-discharge mower deck with cutting height of 1.0-4.0 in (25-102 mm) and mechanical lift system, 38", 42" front-mount single-stage snowblower, and 42" front-mount blade with lift height of 5 in (125 mm).

Engine Troubleshooting
Engine hard to start or won't start
No gasoline in tank - Add gasoline
Wrong fuel grade - Use correct gasoline grade
Air in the fuel lines - Bleed the fuel lines
Damaged spark plug wiring connection - Inspect the spark plug wire connection, replace or repair
Defective spark plug - Change spark plug
Fuel filter is plugged - Fuel filter needs to be replaced
Safety contact for brake pedal defective - Install new part
Carburetor is clogged - Clean the carburetor
Engine has bad compression - Check cylinder block and change wear parts
Damaged or incorrectly adjusted choke cable - Replace cable or adjust properly
Unstable engine running
Air intake screen is blocked - Wash or clean as required
Ignition system malfunction - Check ignition and replace faulty components
Choke cable is defective or stuck - Change or clean the cable
Clogged air filter - Change or service air filter
Dirty or faulty fuel pump - Clean or replace fuel pump
Engine starts but stalls suddenly
Spark plug is defective - Change spark plug
Clogged or faulty carburetor - Service or repair carburetor
Ignition coil is damaged - Install a new ignition coil
Valve springs are broken or bad - Install new valve springs
Valves sticking - Clean the valves
Engine overheated
Engine oil level is low - Fill up the engine oil
Engine is overloaded - Reduce load
Air intake screen is blocked - Wash or clean as required
Too lean carburetor mixture - Adjust carburetor properly
Improper ignition timing - Set the ignition timing properly
Valve setting is improper - Set the valves correctly
Engine knocking sound or abnormal noise
Low octane gasoline - Use proper fuel
Engine is running overloaded - Reduce engine load
Not enough engine oil - Check and refill engine oil
Improperly adjusted low idle speed - Adjustment required
Dirty or faulty fuel pump - Clean or replace fuel pump
Crankshaft or main bearings failure - Change defective components as required
Valve clearance is improper - Adjustment procedure required
Damaged cylinder bore or piston rings - Change defective parts
Engine power loss
Incorrectly adjusted or dirty carburetor - Service or properly adjust carburetor
Air filter element is plugged - Replace or service air filter
Clogged or defective fuel pump - Service or replace fuel pump
Ignition failure - Inspect ignition system and change failed components
Defective cylinder head gasket - Install new cylinder head gasket
Burned or stuck valves - Replace or service valves
Push rod is worn or damaged - Install a new push rod
Cylinder block components are faulty - Replace defective parts as required
High fuel consumption
Throttle opening is not full - Adjust or change throttle cable
Improper carburetor main jet adjustment - Adjust the carburetor main jet correctly
Defective or loose spark plug - Re-tighten or change the spark plug
Valves are stuck, worn, or burned - Change or clean valves
Worn rings, piston, or sleeve - Replace faulty components as required
Excessive valve clearance - Adjustment procedure required
Engine consuming too much oil
Damaged seals or gaskets - Replace worn parts to avoid leaks
Valve stems or guides are damaged - Valves replacement required
Worn or broken piston rings - Replace piston rings
Cylinder liner or piston is scuffed - Check liner and piston, replace as required
Blocked breather hose or pipe - Clean or change

Hydrostatic Transmission Troubleshooting
HST transmission noise
Speed control linkage is defective or unadjusted - Change or adjust linkage
Transmission is under excessive load - Reduce transmission load
Dirty transmission fluid or insufficient fluid level - Top up to proper level or change transmission fluid
Transmission components are damaged or worn - Check internal transmission parts and replace if required
Shifting is hard
Loose or broken shift linkage - Change defective linkage
Hydrostatic pump is seized or faulty - Change or repair pump
Transmission shift control components are defective or misadjusted - Adjust correctly or replace
Lack of power
Transmission oil insufficient - Fill the transmission housing with oil
Drive pulley is defective or worn - Replace pulley
Damaged or misadjusted shifter linkage - Change or adjust linkage
Worn or unadjusted speed control linkage - Repair or adjust linkage
Transmission leakage
Transmission gaskets or seals are damaged - Replace seals or gaskets
Final drive shaft leaks - Shaft seals need to be changed
Cracked transmission housing - Housing needs to be replaced

Mower Deck Troubleshooting
Mower vibrates excessively
Drive sheave of mower deck is dirty or worn - Replace or clean sheave
Damaged or loose drive belt - Adjust belt tension or install a new belt
Unbalanced or warped mower blades - Change or balance blades
Loose blade bolts tightening - Bolts should be tightened
Discharge chute is regularly plugged
Mowing speed is too high - Need to slow down
Grass is too long - Use a lower cutting height
Reduced engine rpm - Adjust carburetor to higher rpm
Cutting level is too low - Adjust mower to higher cutting height
Improper drive belt installation - Install drive belt correctly
Uncut grass when mowing
Discharge chute is plugged - Check cutting deck and clean as necessary
Blades are too dull - Need a blade sharpening
Worn or damaged blades - Blades must be changed
Mowing speed is too high - Select a slower speed
Cutting level is too low - Adjust mower to higher cutting height
Full grass bag - Grass bag must be empty
Blade scalped grass
Lawn is uneven or bumpy - Lawn leveling required
Mower deck set to low cutting - Adjust mower to higher cutting height
Fast ground speed - Operate at slower speed
Deck level is not correct - Adjust the level of mower deck correctly
Damaged or bent blades - Blades need to be replaced
Incorrect tire pressure - Correct tire pressure
Uneven cut
Tires are not properly inflated - Inflate tires as required
Improper mower deck level - Adjust mower deck level properly
Blades are too dull - Blades need to be sharpened
Bent or worn blades - Change the blades
Mower deck is clogged - Mower deck needs to be cleaned
Broken mower deck housing - Rebuild or change mower deck
Mower spindle is faulty or loose - Install new spindle or repair it

Electrical Troubleshooting
Battery does not charge
Electrical cable connections are corroded or loose - Clean or tighten connections
Battery terminal connectors are faulty - Replace terminal connectors
Battery bad cell - Battery replacement required
Starter motor turns slow
Battery capacity is low - Battery is drained, recharge it
Battery is not holding charge - Battery needs service or replacement
Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals
Starter doesn't crank
Battery is discharged or defective - Charge or replace the battery
Wiring is improperly connected or disconnected - Check wiring and connect properly
Battery capacity is low - Battery is drained, charge it
Faulty or incorrectly gapped spark plug - Replace or clean and gap
Starter motor or solenoid is damaged - Starter/solenoid should be replaced




Lawn and Garden Tractors Technical Specs